Tara Mandalaywala, 2012. Variance-sensitive choice in lemurs: constancy trumps quantity.

Numerous studies have demonstrated that animals’ tolerance for risk when foraging can be affected by changes in metabolic state. Specifically, animals on a negative energy budget increase their preferences for risk, while animals on a positive energy budget are typically risk-averse. The malleability of these preferences may be evolutionarily advantageous, and important for maximizing chances of survival during brief periods of energetic stress.

Maclean, E.L., Mandalaywala, T.M., Brannon, E.M. (2012). Variance-sensitive choice in lemurs: constancy trumps quantity. Animal Cognition, 15:15-25.